Weight Converter
Convert weight and mass between pounds, kilograms, ounces, grams, stones, and tons — enter a value and choose your units.
Common weight conversions
| From | To | Multiply by |
|---|---|---|
| Pounds | Kilograms | 0.4536 |
| Kilograms | Pounds | 2.205 |
| Ounces | Grams | 28.35 |
| Grams | Ounces | 0.03527 |
| Stones | Pounds | 14 |
| Pounds | Ounces | 16 |
1 kg = 2.205 lb · 1 lb = 16 oz = 453.6 g · 1 oz = 28.35 g · 1 stone = 14 lb
A package weighs 15 lb. For a customs form requiring kilograms: 15 × 0.4536 ≈ 6.80 kg.
Everyday weight conversions
Weight conversions come up in cooking, shipping, fitness, and travel. A note on words: "weight" and "mass" are used interchangeably here, as everyday units like the kilogram technically measure mass. For body weight, the UK often uses stones (14 lb each), while most of the world uses kilograms — handy to know when reading a BMI or ideal weight result. For lengths and temperatures, see the length and temperature converters.
Weight vs. mass: does the distinction matter here?
Technically, mass (kilograms, grams) measures the amount of matter in an object, while weight (pounds, the everyday sense of the word) measures the force gravity exerts on that mass — the same object would weigh less on the Moon but have identical mass. For every practical purpose on Earth — cooking, shipping, body weight, gym plates — the distinction doesn't change the conversion math, which is why this calculator and most everyday usage treat the two interchangeably.
Common weight-conversion mistakes
- Confusing a metric tonne with a US short ton. A metric tonne is 1,000 kg (≈2,205 lb) while a US short ton is 2,000 lb (≈907 kg) — about 10% lighter. Freight quotes that say "tons" without specifying which kind can be off by a meaningful margin.
- Treating a stone as an approximate conversion. A stone is exactly 14 pounds, not roughly 14 — unlike some rounded decimal metric factors, this one is exact.
- Mixing up grams and ounces on a kitchen scale. A gram and an ounce differ by nearly 30x, so misreading the unit on a digital scale can ruin a recipe's proportions rather than just shifting them slightly.
Frequently asked questions
How many pounds in a kilogram?
About 2.205 lb (1 lb = 0.4536 kg).
How many grams in an ounce?
28.35 g. A pound is 16 oz ≈ 453.6 g.
What is a stone in pounds?
14 pounds. 10 stone = 140 lb ≈ 63.5 kg.
Is there really a difference between weight and mass?
Yes, technically — mass is the amount of matter in an object while weight is the gravitational force on that mass — but for everyday Earth-based conversions like cooking or body weight, the distinction doesn't affect the math, so the terms are used interchangeably here.
What's the difference between a metric tonne and a US ton?
A metric tonne is 1,000 kg (~2,205 lb); a US short ton is 2,000 lb (~907 kg) — about 10% lighter than a tonne.
How do I convert grams to ounces for a recipe?
Divide grams by 28.35. 100 g of flour ≈ 3.53 oz.
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Last reviewed: September 2026.